A butterfly is able to produce offspring only in its adult stage. This is when it has fully developed wings, can fly, and has reproductive organs.

Here's a breakdown of the butterfly life cycle:

* Egg: The butterfly begins life as an egg.

* Larva (Caterpillar): The egg hatches into a larva, which eats and grows.

* Pupa (Chrysalis): The larva forms a chrysalis, where it undergoes metamorphosis.

* Adult: The adult butterfly emerges from the chrysalis, ready to mate and lay eggs.

It's important to note that butterflies only reproduce during the adult stage.